[Question] Dynamic register offset

[rmsyn]

In some peripherals, a register offset is defined by reading the value of another register at runtime.

For example, the USB XHCI op and run registers:

• op: https://elixir.bootlin.com/linux/latest/source/drivers/usb/host/xhci.c#L5221
• run: https://elixir.bootlin.com/linux/latest/source/drivers/usb/host/xhci.c#L5223

The structure of the register clusters are static, and it looks like the value for those registers is likely to be static per actual implementation.

Is there a way to define these type of registers in SVD?

Something like leaving the addressOffset empty, and requiring the generated code to supply the offset as a parameter?

Another alternative I guess would be to run code on the board to query the values of the relevant registers, and use the result in the SVD per-implementation.

It may just be that higher-level abstractions (like actual drivers or HALs) are a better place to handle register definitions like those above.